We have stated that the omission of cooling and lubricating increases the heat load of the workpiece and it leads to changes in the process characteristics of hard turning. That is why we examined the heat characteristics, the cutting strength, the chip deformation and the wear of the tool. On the basis of geometrical characteristics, surface roughness and a multi direction examination of the surface layer, we introduced the changes on a workpiece.
With the method of finite difference we carried out the numerical examination of the typical surfaces' temperature area. For the determination and visualisation of temperature area we applied FLUENT finite volumes software.
We defined the design principles with which the prescribed for precision machining size and form accuracy can be reached just like with grinding.
With the help of 3D roughness parameters we defined the technological parameters for hard turning, with which the same or better surface can be reached than in grinding.
We stated that from the point of view of lifetime, the under surface layer of the hard turned surfaces is more advantageous than that of the ground ones.
We determined the cutting conditions and relationships with the help of which the emerge of the white layer - which is not advantageous for the process - can be avoided.
We elaborated a method with which the allowed wear of the cutting tool can be defined taking the roughness characteristic prescribed in the part drawing into consideration.
To be able to choose purposefully among the finish machining processes, we elaborated a criterion system and a decision algorithm.

Kundrák J., Tóth T., Gyáni K.: How to make a choice of machining methods on the basis of economy: comparison between hard turning and grinding, In: Proceedings of the 11. International Conference on Machine Design and Production (UMTIK 2004), Antalya, pp.:31-45., 2004

Kundrák J., Bana V.: Microgeometry of bore-holes after hard machining, In: Proceeding of the International Conference on Trends and Development of Machinery and Associated Technology (TMT), Lloret de Mar, Barcelona, pp. 93-96, 2003

Kundrák J: Applicability of hard cutting for machining of hardened bore-holes, In: Proceedings of the Fifth International Symposium on Tools and Methods of Competitive Engineering (TMCE 2004), Lausanne, pp.:649-660, 2004

Kundrák J: Research and Development in Hard Cutting, In:2nd International Conference of „Research and Education” Miskolc: 2004 pp.95-102, 2004

Tóth T., Kundrák J., Gyáni K.: The material removal rate and the surface rate as two new parameters of qualification for hard turning and grinding, In: Proceedings of the Fifth International Symposium on Tools and Methods of Competitive Engineering (TMCE 2004), Lausanne, pp.:629-639, 2004